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Related Experiment Videos

Dynamical Crossovers in Prethermal Critical States.

Alessio Chiocchetta1,2, Andrea Gambassi2, Sebastian Diehl1

  • 1Institut für Theoretische Physik, Universität zu Köln, D-50937 Cologne, Germany.

Physical Review Letters
|April 15, 2017
PubMed
Summary

Researchers explored quantum field theory dynamics after a sudden quench near a critical point. The study reveals universal scaling regimes and crossovers, suggesting quenches can probe nonequilibrium quantum many-body systems.

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Area of Science:

  • Quantum Field Theory
  • Many-Body Physics
  • Statistical Mechanics

Background:

  • Prethermal dynamics describe systems evolving towards equilibrium after a quench.
  • Dynamical critical points are crucial for understanding nonequilibrium phase transitions.
  • Quantum systems exhibit complex behaviors far from equilibrium.

Purpose of the Study:

  • Investigate prethermal dynamics in an interacting quantum field theory with O(N) symmetry.
  • Analyze the impact of sudden quenches near a dynamical critical point.
  • Explore universal scaling regimes and crossovers in nonequilibrium evolution.

Main Methods:

  • Utilized renormalization group techniques.
  • Employed a nonperturbative large-N limit approximation.

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  • Studied the order parameter, response, and correlation functions.

    • Main Results:

    • Observed temporal crossovers between quantum and classical prethermal fixed points.
    • Identified crossovers from Gaussian to non-Gaussian prethermal dynamical scaling.
    • Demonstrated universal dynamical scaling regimes dependent on initial conditions.

    Conclusions:

    • Sudden quenches can be a tool to explore dynamical critical points in quantum many-body systems.
    • The findings align with recent experimental observations.
    • Prethermal dynamics offer insights into the complex behavior of quantum systems out of equilibrium.